Photothermographic stabilizers
AssigneeMinnesota Mining and Manufacturing Company
InventorsEdward J. Goettert, Gustav Gutman
Life of this patent
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Abstract
The addition of certain classes of aromatic nitrogen containing compounds to photothermographic emulsions stabilizes the background density of the imaged film and/or increases the speed of the emulsion.
Claims10
An unimaged photothermographic system having at least one emulsion layer comprising an image-silver source material of organic silver salts or complexed silver salts where the coordinating compound has a gross stability constant of between 4.50 and 10.0 with silver ion, silver halide in catalytic proximity to the image-silver source material, and a reducing agent for silver ion, where said system is characterized by having from 0.1/1 to 20/1 molar ratio to the silver halide in said emulsion of a heterocyclic compound selected from the group consisting of pyridines, 2-picolines, nicotinates, isonicotinates, 2,6-lutidenes, 4-picolines, quinolines, pyrazines, pyridazines, and pyrimidines.
Dependencies are inferred from the claim text.